Remove extra blank line.

Where is call to HDF controller?

Monitors should come before mode mgmt above.

What about HemoDiaFiltration.h?

What about initHDF?

Where is HemoDiaFiltration.h?

Why does this file name have pound signs pre/post?

On DD f/w side, this should just be a simple pump controller. States should be Off and On (control to commanded Qsub). There is no flow sensor for feedback control, so assuming this is open loop similar to UF pump.
GenDialysate mode will have an HDF sub-state that signals this controller from Off to On and would also call separate controller for heater and separate (Switches) monitor for door sensors.

This macro is already defined in Common.h.

Align all "=" or none of them.

DD HDF control data published should just be state and set rate. TD HDF data would have volume, etc...

This looks like pump control function. I think TD f/w should be doing this when setting Qsub before sending to DD f/w. Again, I think DD f/w should just be controlling pump to the Qsub rate given by TD f/w.
HDF volume should be calculated by TD f/w by integrating commanded Qsub over time.

Remove blank line.

Refactor so that only one return statement at end of function. This is in our coding standards.

I think TD should be handling all of these rules before setting Qsub and sending to DD.

Generally, DD shouldn't need TMP. TD is calculating TMP. TD is using TMP to calculate Qsub. DD is just getting Qsub from TD and controlling the pump to that rate.

Indent declarations.

How can we help you with this?

Doesn't match file name. Why do we have a redundant file name with ~ suffix for your new units? If these are backup files from your editor, please do not add these to the git repo (delete them before commit).

DD is not calculating the rate I think. TD is sending target HDF rate to DD. So "calculated" should be "requested" or "commanded".

Add space before )

Add blank line before return statement.

Align doxygen comments to right.

Add blank line before banner